Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe903e20c88e6de…

MALICIOUS

PDF

96.2 KB Created: 2021-07-23 10:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29da803a7dff449c9a7daa5078c712f2 SHA-1: 6894715cc771c20f88006be65c3bec04a51164c2 SHA-256: cfe903e20c88e6de01a8d738437565e762a9c16b13b62545c6e54c11ffb29c25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ikima.fr/uploads/file/voxogomematada.pdf
    • https://cafepiolho.com/uploads/assets/siwofasuvuxov.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kdlgka5nm24q1hm31ja8o0vgn1/20044163294.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acdf2c91346---zopafuj.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d5f6bb39eba42d78885160a73b8d84ca/80573424625.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/9868cc3a6ce6f118b64b339b62a18570/38436276902.pdf
    • https://widepolymers.com/userfiles/file/67748701159.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f13bf415e101f7ad97d70ec56456af0a/97028237288.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/luvarikox.pdf
    • http://thenext.pk/userfiles/files/58826840256.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/77111916643.pdf
    • http://daikinhbac.com/upload/files/65273584774.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/68ab4ec702e8f20878a6d3a20676e273/91387651605.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2m93s3aiaho65bgb8o7oucf117/rewegozeteti.pdf
    • https://hpsoft.shop/upload/files/97952194912.pdf
    • http://augustaelectricalwork.com/editorData/file/xuvatasebopoxajeferez.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607881c0a5edc---67435324456.pdf
    • http://stromzeleny.cz/file/15435320913.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/168bdf96572db6e92a5c957d15721495/vinufutujufirilexorutute.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7e33d31a5e65ffacf6852ef4963600f6/nerufufegeroxadewoker.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b396c6d8eb---78929285119.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/68500824214.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/76939373022.pdf
    • http://asirakademi.com/resimler/files/61493182872.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6ea609c5---janomel.pdf
    • http://asahiru-ban.com/files/files/83980123081.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fairy+tail+100+years+quest+episode+1
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d9.bin
dac67f3ddd1bdc9ce410f85a4c9f16a5d196f0637b91e480abdad094b53ad9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 2680 bytes
font_01_sfnt_off0000fd53.bin
eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 16132 bytes
font_02_sfnt_off000112c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 16792 bytes
font_03_sfnt_off00012ad6.bin
329699de985cff8cd486e573128537943a219120793df7281c7c1bd86b2ffcd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 17552 bytes
font_04_sfnt_off000158e5.bin
05ef4126dcc067b649995c9ab5caa3b19c798da8571669b8c0bf93e47cb5a277		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158E5 10792 bytes

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